Hibernate链接数据文件

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//hibernate 配置文件

//放在src 文件夹下的 hibernate.cfg.xml

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>

<session-factory>


<property name="hibernate.connection.driver_class">oracle.jdbc.driver.OracleDriver</property>

<property name="hibernate.connection.url">jdbc:oracle:thin:@localhost:1521:orcl</property>

<property name="hibernate.connection.username">scott</property>

<property name="hibernate.connection.password">123456</property>

<property name="hibernate.dialect">org.hibernate.dialect.OracleDialect</property>

<property name="hibernate.show_sql">true</property>

<property name="hibernate.format_sql">true</property>

<property name="hibernate.hbm2ddl.auto">update</property>


<mapping resource="com/yh/po/User.hbm.xml"/>

</session-factory>

</hibernate-configuration>

实体配置文件 User.hbm.xml

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">

<hibernate-mapping>
   
    <class name="com.yh.po.User" table="hibernate_user">
        <id name="id" type="int">
            <column name="ID" />
            
            <generator class="sequence">
            <param name="sequence">seq_user</param> 
            </generator>
           
        </id>
        
        <property name="userName" type="java.lang.String">
            <column name="user_name" />
        </property>
        <property name="password" type="java.lang.String">
            <column name="pwd" />
        </property>
    </class>
</hibernate-mapping>

实体类文件

package com.yh.po;

public class User{

   private int id;
   private String userName;
   private String password;


   public int getId() {
       return id;
   }
   public void setId(int id) {
       this.id = id;
   }
   public String getUserName() {
       return userName;
   }
   public void setUserName(String userName) {
       this.userName = userName;
   }
   public String getPassword() {
       return password;
   }
   public void setPassword(String password) {
       this.password = password;
   }



}

//数据库链接文件

package com.yh.db;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;

public class DatabaseConnection {
   private static Configuration configuration=null;
   private static SessionFactory sessionFactory=null;


   static{
                //1.创建一个解析配置文件的Configuration对象 configure() 默认会去src下找一个叫hibernate.cfg.xml的配置文件
               configuration=new Configuration().configure();
               //2.创建数据源代理
               sessionFactory=configuration.buildSessionFactory();
   }


   public static Session getSession(){
       return sessionFactory.openSession();
   }


}

package com.yh.test;

import static org.junit.Assert.*;

import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import org.junit.Test;

import com.yh.po.User;

public class TestUser {




   @Test
   public void test() {

       //1.创建一个解析配置文件的Configuration对象 configure() 默认会去src下找一个叫hibernate.cfg.xml的配置文件
       Configuration configuration=new Configuration().configure();

       //2.创建数据源代理
       SessionFactory sessionFactory=configuration.buildSessionFactory();

       //3.得到一个session对象 sessionFactory 的openSession()
       Session session=sessionFactory.openSession();

       //4.开启事务 session.beginTransaction()
       Transaction tx=session.beginTransaction();

       try{
       User user=new User();
       user.setUserName("yunhe_user");
       user.setPassword("123456");
        //插入数据
       session.save(user);
       //5.提交事务
       tx.commit();
       }catch(Exception e){
       //6.事务回滚
       tx.rollback();
       }finally{
           if(session!=null){
               //7.关闭session
               session.close();
           }
       }
   }

}

//package com.yh.test;

import static org.junit.Assert.*;

import org.hibernate.Session;
import org.hibernate.Transaction;
import org.junit.Before;
import org.junit.Test;

import com.yh.db.DatabaseConnection;
import com.yh.po.User;

public class TestUser2 {

   @Test
   public void test() {
       query();
       add();
   }

   public void add(){
       Session session=null;
       Transaction tx=null;
       try{
       session=DatabaseConnection.getSession();
       //开启事务(save,update,delete操作，必须开启事务)
       tx=session.beginTransaction();
       User user=new User();
       user.setUserName("test002");
       user.setPassword("8888");
       session.save(user);
       tx.commit();
       }catch(Exception e){
           tx.rollback();
       }
       /*finally{
       session.close();
       }*/

   }

    public void update(){

   }

    public void delete(){

    }

   public void query(){

       Session session=DatabaseConnection.getSession();
       //get()或load()
       /*
        * get():当查询到id不存在时，返回null，不会发生异常信息
          load():当查询到id不存在时，报异常信息
        */
       User user= (User) session.get(User.class, 5793);
       System.out.println(user);


    }
}

jar包

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